<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    /* 阿拉伯字体的letter-spacing必须是0 */
    .box {
      letter-spacing: 10px;
    }
  </style>
</head>
<body>
  <div class="box">I am a worker</div>
</body>
</html>